Memory Leak with std::unique_ptr and Custom Deleter in C++20
I'm getting frustrated with I'm performance testing and I'm working on a personal project and After trying multiple solutions online, I still can't figure this out. I'm encountering a memory leak issue while using `std::unique_ptr` with a custom deleter in C++20. I created a simple class that manages a dynamically allocated array, but despite the custom deleter, it seems that the memory isn't being freed as expected. Here's a simplified version of my code: ```cpp #include <iostream> #include <memory> #include <vector> class ArrayManager { public: ArrayManager(size_t size) : size(size), data(new int[size]) {} ~ArrayManager() { std::cout << "Destructor called, freeing memory." << std::endl; delete[] data; } int& operator[](size_t index) { return data[index]; } private: size_t size; int* data; }; void customDeleter(ArrayManager* ptr) { std::cout << "Custom deleter called." << std::endl; delete ptr; } int main() { std::unique_ptr<ArrayManager, decltype(&customDeleter)> manager(new ArrayManager(10), customDeleter); for (size_t i = 0; i < 10; ++i) { manager->operator[](i) = i * 10; } // Intentionally releasing the unique_ptr without deleting the managed object manager.release(); // Memory leak occurs here, as there's no longer any deleter return 0; } ``` The issue seems to arise when I call `manager.release()`. I expected that the custom deleter would still manage to free the memory, but instead, the destructor of `ArrayManager` never gets called, leading to a memory leak. Is there a proper way to handle this situation or should I reconsider my design? I'm using g++ version 10.2, and I haven't seen clear documentation on the nuances of releasing `unique_ptr` with custom deleters. Any insights or best practices would be greatly appreciated! What's the best practice here? My development environment is Windows 10. Any ideas what could be causing this? What's the best practice here?